Extrusion & Post
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Poor compatibility and delamination of PET modified material
Problem Phenomenon
Obvious delamination and poor mechanical properties when PET is blended with PE, PP and other polymers for modification.
Cause Analysis
PET and non-polar polymers are thermodynamically incompatible with large interfacial tension, no compatibilizer used or insufficient dosage, improper mixing parameters.
Solution
Use suitable compatibilizers (SEBS-g-MAH, etc.); optimize mixing process (twin-screw, appropriate shear and temperature); control compatibilizer 3-8%.
Key Takeaway
The core of PET blend modification lies in improving interfacial compatibility.
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